Find the volume of the entire unit cell including the empty space in terms of r. Remember for a cube the volume, V= l x w x h. You already know the edge length of the side in terms of “r” based in the earlier questions. Answer: __________ h. Find the fraction of the total volume of the cube (which is the unit cell’s volume) is occupied by the atoms. Express this as percent. Write also your answer in the summary table. Answer: __________

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Crystal Lattices and Unit Cell

Consider a crystal. The regular and repeating pattern of constituent particles is the most distinguishing feature of crystalline solids. A crystal lattice is formed when these particles are replaced with representative points. The three-dimensional arrangement of constituent particles is known as a crystal lattice. Unit cell is that the smallest portion of a space lattice which when repeated in several directions, generate the whole lattice. Unit cell is a building block of a lattice. It is the smallest unit of cell.